大面积堆载作用下轴向受力隔离桩的承载机制分析

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Abstract This paper aims at analyzing the passive mechanical characteristics of axially loaded isolation piles under large-scale surcharge loading. Firstly，the formulation for calculating lateral additional pressure with local surcharge is deduced based on the solution of improved Boussinesq. Then according to soil movement and stress transfer approach，the rational passive load distribution of isolation piles is obtained by improving local deformation theory of plasticity considering soil arching. Finally，differential equations of elastic and plastic regions of isolated piles are established by considering the gravity second-order effect caused by lateral load and yield of soil for tri-parameter Winkler elastic foundation beam model. Combining matrix transfer method with Laplace forward and inverse transformation，the numerical solution of passive mechanical features of isolation piles is obtained. Later，the proposed approach is verified by the test data. The results indicate that the numerical and measured results are in good agreement，and the proposed approach is applicable in engineering practice.

Key words： pile foundations surcharge load isolation piles Laplace forward and inverse transformation matrix transfer method

Received: 18 March 2013

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http://www.rockmech.org/EN/Y2014/V33/I2/421

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